Missing and dropped network drives

We have a Windows 2000 level Active Directory, our system runs a 50/50 mix of WIN 2000 and 2K3. Our users are given a set of mapped network drives when they login every day. Lately when our users login in the morning not all of their drives populate. If they reboot they show back up. Users are also reporting "dropped drives" in the middle of the day. Any ideas?

Not sure why the issue maybe occuring but I will make some suggestions.

Try a script or DOS command (net use below) to map the drives again on login. Also as a temporary solution you could provide these script or batch files to customers and instruct them to use them if they lose the mapping's.

"net use u: \\servername\%username% /persistent:yes"

Also noted that this issue occurs at 2 different times of the day. The issue that occurs first thing in the morning. I have seen this kind of scenario happen once before and it was due to old desktop units being used a dedicated NW server. Also look at your NW infrastructure can your traffic be routed better? Cause you may have xxxx amount of users all trying to grab various NW resources first thing everymorning and the NW cannot handle all the tasks.

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